Response Header Logging

[byoungb]

Not sure what I am doing wrong. Or if I am just missing something or if it is not possible. But I want to log some response headers in the access logs. I have seen posts that make it appear possible and also others that make me unsure if it is possible. I am running traefik in a k8s cluster and I can see the response header in dev tools... but not in the logs.. my access logs are setup like this...

accessLog:
  format: json
  fields:
    defaultMode: keep
    headers:
      defaultMode: keep

And I can see all the request headers, just not the response headers... I am writing X-Member-ID in the response header, and I do not have any logs with the response_ prefix and also none with Member.

I have done this for years with HAProxy and just assumed that it would be possible with traefik.

Keep http middleware removed header in access log

Currently I have configured HTTP middleware to remove a particular response header so it does not propagate to HTTP clients. However, I would like this header to be accessible in access log. Current configuration in access log to keep header is not helpful as I understand logging middleware is the the last in the chain and it cannot access removed response header. Is there a simple way to have this response header in access log?

Logging Origin Headers

The docs are very unclear if response headers are included, since it does not make any references to them one way or another... and basically everything is just called headers (not prefixed by request or response)